Merge pull request #5 from caktux/master

get cpp versions, add osx lock, auto-bump brew version, exceptionToSuccess
show build status image
show latest finished build
remove branch from codebase
go ethereum build factory
multiple branch support for go-ethereum
retry image and show unknown
master and develop for cpp-ethereum
win_cpp_factory
master and develop for windows cpp-ethereum builders
pyethereum behave and py.test
prevent all builders from rebuilding on ethereum-dockers
use workdir
add go-ethereum-osx-brew